/*
vgui_main.h - vgui main header
Copyright (C) 2011 Uncle Mike

This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.
*/

#ifndef VGUI_MAIN_H
#define VGUI_MAIN_H

#include "utlvector.h"
#include "utlrbtree.h"

#include<VGUI.h>
#include<VGUI_App.h>
#include<VGUI_Font.h>
#include<VGUI_Panel.h>
#include<VGUI_Cursor.h>
#include<VGUI_SurfaceBase.h>
#include<VGUI_InputSignal.h>
#include<VGUI_MouseCode.h>
#include<VGUI_KeyCode.h>

using namespace vgui;

class FontCache
{
public:
	FontCache();
	~FontCache() { }

	// returns a texture ID and a pointer to an array of 4 texture coords for the given character & font
	// uploads more texture if necessary
	bool GetTextureForChar( Font *font, char ch, int *textureID, float **texCoords );
private:
	// NOTE: If you change this, change s_pFontPageSize
	enum
	{
		FONT_PAGE_SIZE_16,
		FONT_PAGE_SIZE_32,
		FONT_PAGE_SIZE_64,
		FONT_PAGE_SIZE_128,
		FONT_PAGE_SIZE_COUNT,
	};

	// a single character in the cache
	typedef unsigned short HCacheEntry;
	struct CacheEntry_t
	{
		Font		*font;
		char		ch;
		byte		page;
		float		texCoords[4];

		HCacheEntry	nextEntry;	// doubly-linked list for use in the LRU
		HCacheEntry	prevEntry;
	};
	
	// a single texture page
	struct Page_t
	{
		short		textureID;
		short		fontHeight;
		short		wide, tall;	// total size of the page
		short		nextX, nextY;	// position to draw any new character positions
	};

	// allocates a new page for a given character
	bool AllocatePageForChar( int charWide, int charTall, int &pageIndex, int &drawX, int &drawY, int &twide, int &ttall );

	// Computes the page size given a character height
	int ComputePageType( int charTall ) const;

	static bool CacheEntryLessFunc( const CacheEntry_t &lhs, const CacheEntry_t &rhs );

	// cache
	typedef CUtlVector<Page_t> FontPageList_t;

	CUtlRBTree<CacheEntry_t, HCacheEntry> m_CharCache;
	FontPageList_t m_PageList;
	int m_pCurrPage[FONT_PAGE_SIZE_COUNT];
	HCacheEntry m_LRUListHeadIndex;

	static int s_pFontPageSize[FONT_PAGE_SIZE_COUNT];
};

class CEngineSurface : public SurfaceBase
{
private:
	struct paintState_t
	{
		Panel	*m_pPanel;
		int	iTranslateX;
		int	iTranslateY;
		int	iScissorLeft;
		int	iScissorRight;
		int	iScissorTop;
		int	iScissorBottom;
	};

	// point translation for current panel
	int		_translateX;
	int		_translateY;

	// the size of the window to draw into
	int		_surfaceExtents[4];

	CUtlVector <paintState_t> _paintStack;

	void SetupPaintState( const paintState_t &paintState );
	void InitVertex( vpoint_t &vertex, int x, int y, float u, float v );
public:
	CEngineSurface( Panel *embeddedPanel );
	~CEngineSurface();	
public:
	virtual Panel *getEmbeddedPanel( void );
	virtual bool setFullscreenMode( int wide, int tall, int bpp );
	virtual void setWindowedMode( void );
	virtual void setTitle( const char *title ) { }
	virtual void createPopup( Panel* embeddedPanel ) { }
	virtual bool isWithin( int x, int y ) { return true; }
	virtual bool hasFocus( void );
protected:
	virtual int createNewTextureID( void );
	virtual void drawSetColor( int r, int g, int b, int a );
	virtual void drawSetTextColor( int r, int g, int b, int a );
	virtual void drawFilledRect( int x0, int y0, int x1, int y1 );
	virtual void drawOutlinedRect( int x0,int y0,int x1,int y1 );
	virtual void drawSetTextFont( Font *font );
	virtual void drawSetTextPos( int x, int y );
	virtual void drawPrintText( const char* text, int textLen );
	virtual void drawSetTextureRGBA( int id, const char* rgba, int wide, int tall );
	virtual void drawSetTexture( int id );
	virtual void drawTexturedRect( int x0, int y0, int x1, int y1 );
	virtual bool createPlat( void ) { return false; }
	virtual bool recreateContext( void ) { return false; }
	virtual void setCursor( Cursor* cursor );
	virtual void pushMakeCurrent( Panel* panel, bool useInsets );
	virtual void popMakeCurrent( Panel* panel );

	// not used in engine instance
	virtual void enableMouseCapture( bool state ) { }
	virtual void invalidate( Panel *panel ) { }
	virtual void setAsTopMost( bool state ) { }
	virtual void applyChanges( void ) { }
	virtual void swapBuffers( void ) { }
protected:
	Font* _hCurrentFont;
	Cursor* _hCurrentCursor;
	int _drawTextPos[2];
	int _drawColor[4];
	int _drawTextColor[4];
	friend class App;
	friend class Panel;
};

// initialize VGUI::App as external (part of engine)
class CEngineApp : public App
{
public:
	CEngineApp( bool externalMain = true ) : App( externalMain ) { }
	virtual void main( int argc, char* argv[] ) { } // stub
	virtual void setCursorPos( int x, int y ); // we need to recompute abs position to window
	virtual void getCursorPos( int &x,int &y );
};

class CEnginePanel : public Panel
{
public:
	virtual SurfaceBase* getSurfaceBase( void );
	virtual App* getApp( void );
};

//
// vgui_input.cpp
//
void VGUI_InitCursors( void );
void VGUI_CursorSelect( Cursor *cursor );
void VGUI_ActivateCurrentCursor( void );

#endif//FONT_CACHE_H